A high-protection, intelligent safety MNS type low-voltage withdrawable switchgear

Abstract

This invention belongs to the field of low-voltage switchgear technology, and specifically relates to a high-protection, intelligent safety MNS-type low-voltage withdrawable switchgear. It includes a switchgear body, multiple drawer units, and multiple support mesh plates for supporting the drawer units. All support mesh plates are fixedly connected to the inner wall of the switchgear body. A uniform-speed insertion / removal mechanism is provided at the top of each drawer unit. This invention enables the MNS-type low-voltage withdrawable switchgear to possess intelligent moisture-proof and efficient cooling functions, improving the switchgear's protection performance and versatility. This enhances the convenience for customers purchasing MNS-type low-voltage withdrawable switchgear. Furthermore, the switchgear features a uniform-speed insertion / removal function for the drawer units, which not only improves the convenience of removing and inspecting the drawer units but also avoids damage to the conductive plug components and conductive socket structure caused by impact insertion of the drawer units, thus preventing increased contact resistance at that location.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage switchgear technology, and in particular relates to a high-protection intelligent safety MNS type low-voltage withdrawable switchgear. Background Technology

[0002] The MNS type low-voltage withdrawable switchgear is a common low-voltage power distribution equipment. Its internal structure is rationally designed, with each functional unit being independent and the drawer units having good interchangeability. It can be flexibly combined according to different power demand and is widely used in power plants, substations, industrial enterprises and other places for centralized control, distribution and protection of low-voltage power. It can effectively improve the stability and reliability of the power supply system. For example, the patent with authorization announcement number CN208062641U discloses an MNS type low-voltage withdrawable switchgear.

[0003] Currently, when customers need to install MNS type low-voltage withdrawable switchgear in humid environments or at altitudes exceeding 2000 meters, they need to order products with higher protection levels from the manufacturer. In high-altitude areas, due to the thin air, the heat dissipation efficiency of the switchgear is significantly reduced, leading to a large accumulation of internal heat, which can easily cause frequent failures. In humid environments, condensation is easily formed on the surface of metal parts under low temperatures, which can cause short circuits in electrical components, seriously affecting the service life and reliability of the switchgear. This not only reflects the problem of insufficient protection capability of MNS type low-voltage withdrawable switchgear on the existing market, but also makes MNS type low-voltage withdrawable switchgear have the defect of limited versatility, and also increases the inconvenience for customers to purchase MNS type low-voltage withdrawable switchgear. Furthermore, in terms of operation, when the drawer unit of the MNS type low-voltage withdrawable switchgear is pulled out, the conductive connection parts are tightly connected, and the operator needs to use inertia to operate it with great effort, which greatly affects the convenience of operation. During the insertion of the drawer unit, due to the lack of a corresponding damping structure, the conductive plug part of the drawer unit will impact the conductive female structure inside the switchgear at a relatively fast speed. This impact not only easily causes surface damage to the conductive plug part and the conductive female structure, but also increases the contact resistance between the conductive plug part and the conductive female structure, making the location prone to overheating failure, which has an adverse effect on the reliability of the drawer unit's operation.

[0004] To address these issues, we propose a high-protection, intelligent, and safe MNS-type low-voltage withdrawable switchgear. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a high-protection, intelligent, and safe MNS-type low-voltage withdrawable switchgear.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-protection intelligent safety MNS type low-voltage withdrawable switchgear, comprising a switchgear body, multiple drawer units and multiple support mesh plates for supporting the drawer units, wherein the multiple support mesh plates are fixedly connected to the inner wall of the switchgear body, the top of each drawer unit is provided with a uniform speed insertion and removal mechanism, and the top of the multiple uniform speed insertion and removal mechanisms are fixedly connected to the lower surface of the support mesh plate and the top of the switchgear body by bolts; A hollow base is fixedly connected to the bottom of the main body of the switch cabinet. A rectangular through hole is opened on the rear side wall of the hollow base, and a support plate is fixedly connected to the wall of the rectangular through hole. An installation through hole that matches the support plate is opened on the front side wall of the hollow base. A partition is fixedly connected to the upper surface of the support plate and the inner wall of the hollow base. The partition divides the top of the hollow base into an air guiding area and a mechanical area. The support plate is fixedly connected to a PLC controller, an air pump, and a cooling auxiliary mechanism on the upper surface of the mechanical area. The air inlet of the air pump is fixedly connected to a filter assembly.

[0007] In the aforementioned high-protection intelligent safety MNS type low-voltage withdrawable switchgear, the uniform speed insertion and removal mechanism includes a cylinder. The two vent holes of the cylinder are respectively fixedly connected to a control solenoid valve and an exhaust nozzle. The inner diameters of the control solenoid valve and the exhaust nozzle are the same. Two fixing rings are fixedly connected to the outer wall of the cylinder. A connecting block is fixedly connected to the moving end of the cylinder. A first connecting hole is opened on the outer wall of the connecting block. A flexible hose is fixedly connected to the air inlet end of the control solenoid valve. The bottom end of the flexible hose is fixedly connected to the upper surface of the hollow base located in the air guiding area. A second connecting hole that mates with the first connecting hole is opened on the rear side wall of the drawer unit.

[0008] In the aforementioned high-protection intelligent safety MNS type low-voltage withdrawable switchgear, the filter assembly includes an air inlet hood fixedly connected to the upper surface of the support plate, a filter screen fixedly connected to the inner wall of the air inlet hood at an incline, an activated carbon filter plate fixedly connected to the outer wall of the filter screen, and the side wall of the air inlet hood fixedly connected to the air inlet end of the air pump.

[0009] In the aforementioned high-protection intelligent safety MNS type low-voltage withdrawable switchgear, the cooling auxiliary mechanism includes a small compressor fixedly connected to the upper surface of a support plate. A circular hole is formed on the upper surface of the support plate in the mechanical area, and a heat insulation cylinder is fixedly connected to the wall of the hole. The outlet of the air pump is fixedly connected to a first air pipe, which is also fixedly connected to the top of the heat insulation cylinder. A three-way pipe is fixedly connected to the bottom side wall of the heat insulation cylinder. One outlet of the three-way pipe is fixedly connected to a second air pipe, which passes through a partition and connects to a ducting area. The other outlet of the three-way pipe is fixedly connected to a thicker ducting pipe. A conductive connector is sealed to the top of the thicker ducting pipe, and the wire of the conductive connector passes through the bottom of the thicker ducting pipe and connects to the input of the PLC controller. The conductive connector is electrically connected to a temperature and humidity sensor. The temperature and humidity sensor is fixedly embedded in the top of the switch cabinet body. The top of the switch cabinet body has a fixed through hole that matches the temperature and humidity sensor. The wall of the air guide pipe is fixedly connected to an air supply assembly with the same number as the drawer unit. An evaporator coil is installed inside the heat insulation cylinder. The top of the evaporator coil passes through the outer wall of the heat insulation cylinder and is fixedly connected to the inlet pipe of the small compressor. The delivery pipe of the small compressor passes through the lower surface of the support plate and is fixedly connected to a condenser assembly. The bottom of the condenser assembly is fixedly connected to a throttling valve pipe. The top of the throttling valve pipe passes through the bottom of the heat insulation cylinder and is fixedly connected to the bottom of the evaporator coil. The bottom of the heat insulation cylinder is fixedly connected to a drain check valve.

[0010] In the aforementioned high-protection intelligent safety MNS type low-voltage withdrawable switchgear, the condenser assembly includes an L-shaped hollow tube. Multiple L-shaped capillary tubes are fixedly connected to the wall of the L-shaped hollow tube. The inlet end of the throttle valve pipeline is fixedly connected to the bottom wall of the L-shaped hollow tube. The bottom end of the output pipeline of the small compressor is fixedly connected to the top end of the L-shaped hollow tube. A support bar is fixedly connected to the inner wall of the bottom end of the hollow base. A cooling fan is fixedly connected to the upper surface of the support bar. An air guide shroud is fixedly connected to the air inlet side of the cooling fan. The air inlet end of the air guide shroud passes through the rear side wall of the hollow base. A liquid level sensor is fixedly connected to the lower surface of the support bar.

[0011] In the aforementioned high-protection intelligent safety MNS type low-voltage withdrawable switchgear, a normally closed solenoid valve and an exhaust pipe are fixedly embedded in the rear side wall of the hollow base, and the normally closed solenoid valve is located at the bottom end of the hollow base.

[0012] In the aforementioned high-protection intelligent safety MNS type low-voltage withdrawable switchgear, the air supply assembly includes a third air pipe that is fixedly connected to the outer wall of the air guide pipe. An L-shaped fixing block is fixedly sleeved on the wall of the air guide pipe. Two threaded holes are opened on the outer wall of the L-shaped fixing block. The air outlet end of the third air pipe is fixedly connected to an external threaded pipe that mates with the first connecting hole and the second connecting hole. Two fixing nuts are threadedly connected to the wall of the external threaded pipe.

[0013] In the aforementioned high-protection intelligent safety MNS type low-voltage withdrawable switchgear, the outer wall of the switchgear body is provided with multiple through holes, and the walls of the through holes are fixedly connected with push switches. The multiple push switches are arranged in sequence with multiple control solenoid valves.

[0014] Compared with existing technologies, the advantages of a high-protection, intelligent safety MNS type low-voltage withdrawable switchgear are: 1. With the installation of an air extraction pump, a cooling auxiliary mechanism, an air supply component, and a condenser component, when the MNS type low-voltage withdrawable switchgear is operating in a humid environment, the PLC controller first controls the air extraction pump and the cooling auxiliary mechanism to operate. The air extraction pump draws air and delivers it to the insulation cylinder, while the cooling auxiliary mechanism cools the inside of the insulation cylinder through a small compressor, condenser component, throttling valve pipeline, and evaporator coil. At this time, the moisture carried in the air will be liquefied into water droplets in the low-temperature environment and fall to the bottom of the insulation cylinder. Finally, the water droplets are discharged into the bottom of the hollow base through a drain check valve. The low-temperature dehumidification improves the dryness of the air injected into the switchgear body, thereby ensuring the dryness of the internal components of the switchgear body. This prevents short circuits caused by condensation on the internal conductive components of the switchgear body. Moreover, the water droplets produced by dehumidification can further assist in the cooling of the condenser component. This mechanism gives the MNS type low-voltage withdrawable switchgear an intelligent moisture-proof function and improves the protection performance of the MNS type low-voltage withdrawable switchgear.

[0015] 2. By incorporating an air pump, temperature and humidity sensors, a cooling auxiliary mechanism, and a PLC controller, if the MNS type low-voltage withdrawable switchgear is located at an altitude exceeding 2000 meters, and the thin air causes heat accumulation inside the switchgear body, creating a high-temperature environment, the temperature and humidity sensors, in conjunction with the PLC controller, increase the air pump's extraction efficiency. This allows more air to be injected into the switchgear body for cooling, preventing interference from the thin air environment at high altitudes on the switchgear's heat dissipation. If the air pump operates at increased speed for 3 minutes, and the temperature and humidity sensors still detect that the internal temperature of the switchgear body exceeds the PLC controller's efficiency, the system can effectively cool the switchgear. After the C controller presets the high temperature threshold, the PLC controller controls the small compressor in the cooling auxiliary mechanism to start, which lowers the temperature of the air injected into the switchgear body. The low temperature air accelerates the cooling effect inside the switchgear body, preventing damage from continuous high temperatures. This mechanism gives the MNS type low-voltage withdrawable switchgear an intelligent and efficient cooling function, improves the switchgear's protection performance, and enables it to adapt to the use requirements of workstations at altitudes exceeding 2000 meters, ensuring the safety of continuous use of the switchgear and improving its versatility. It also increases the convenience for customers to purchase the MNS type low-voltage withdrawable switchgear.

[0016] 3. Through the set uniform speed insertion and removal mechanism, external threaded tube, and fixing nut, when the drawer unit of the MNS type low-voltage withdrawable switchgear needs to be pulled out for inspection or maintenance during use, the operator presses the push switch corresponding to the drawer unit to be pulled out. This push switch, in conjunction with the PLC controller, controls the cylinder of the corresponding uniform speed insertion and removal mechanism to extend at a uniform speed. Then, the uniform speed insertion and removal mechanism drives the conductive plug component of the drawer unit to separate from the conductive female structure inside the switchgear body at a uniform speed, eliminating the need for manual force to pull out the drawer unit. Conversely, when the drawer unit needs to be installed, the uniform speed insertion and removal mechanism can drive the conductive plug component of the drawer unit to be inserted into the conductive female structure inside the switchgear body at a uniform speed, thereby reducing damage between the conductive plug component and the conductive female structure, and preventing overheating failure due to increased contact resistance at this connection point. This mechanism enables the MNS type low-voltage withdrawable switchgear to have the function of uniform speed insertion and removal of drawer units. This not only improves the convenience of pulling out the drawer unit for inspection and maintenance, but also avoids damage between the conductive plug component and the conductive female structure caused by impact insertion of the drawer unit, thus improving the reliability of the switchgear. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention; Figure 2 This is a cross-sectional view of the right side of the hollow base in a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention. Figure 3 yes Figure 2 A partially enlarged structural diagram; Figure 4 This is a schematic diagram of the internal structure of the heat insulation cylinder in a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention; Figure 5 This is a schematic diagram of the drawer unit in a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention; Figure 6 yes Figure 1 A partially enlarged structural diagram; Figure 7 This is a schematic diagram of the uniform speed insertion and removal mechanism in a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention. Figure 8 This is a schematic diagram of the L-shaped fixing block portion in a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention; Figure 9 This is a schematic diagram of the L-shaped hollow tube section in a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention; Figure 10 This is a schematic diagram of the structure of the filter component in a high-protection intelligent safety MNS type low-voltage withdrawable switchgear provided by the present invention.

[0018] In the diagram: 1. Switch cabinet body; 2. Drawer unit; 3. Support mesh plate; 4. Uniform speed insertion / removal mechanism; 41. Cylinder; 42. Control solenoid valve; 43. Exhaust nozzle; 44. Fixing ring; 45. Connecting block; 46. First connecting hole; 47. Hose; 48. Second connecting hole; 5. Hollow base; 6. Cooling auxiliary mechanism; 61. Small compressor; 62. Heat insulation cylinder; 63. First gas pipe; 64. T-pipe; 65. Second gas pipe; 66. Large gas guide pipe; 67. Conductive connector; 68. Temperature and humidity sensor; 69. Evaporator coil; 610. Throttling valve pipeline; 611. Drain check valve. 7. Filter assembly, 71. Air inlet hood, 72. Filter screen, 73. Activated carbon filter plate, 8. Air supply assembly, 81. Third air pipe, 82. L-shaped fixing block, 83. Threaded hole, 84. External threaded pipe, 85. Fixing nut, 9. Condenser assembly, 91. L-shaped hollow tube, 92. L-shaped capillary tube, 93. Support bar, 94. Cooling fan, 95. Air guide hood, 96. Liquid level sensor, 10. Support plate, 11. Partition, 12. Air guide area, 13. Mechanical area, 14. PLC controller, 15. Air pump, 16. Normally closed solenoid valve, 17. Exhaust duct, 18. Press switch. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-10 As shown, a high-protection intelligent safety MNS type low-voltage withdrawable switchgear includes a switchgear body 1, multiple drawer units 2, and multiple support mesh plates 3 for supporting the drawer units 2. The multiple support mesh plates 3 are all fixedly connected to the inner wall of the switchgear body 1. A uniform speed insertion / removal mechanism 4 is provided at the top of each drawer unit 2, and the tops of the multiple uniform speed insertion / removal mechanisms 4 are fixedly connected to the lower surface of the support mesh plates 3 and the top of the switchgear body 1 by bolts. The uniform speed insertion / removal mechanism 4 includes a cylinder 41. Two vent holes of the cylinder 41 are respectively fixedly connected to a control solenoid valve 42 and an exhaust nozzle 43. The inner diameters of the control solenoid valve 42 and the exhaust nozzle 43 are the same. Two... A fixed ring 44, a connecting block 45 is fixedly connected to the moving end of the cylinder 41, a first connecting hole 46 is opened on the outer wall of the connecting block 45, a hose 47 is fixedly connected to the air inlet end of the control solenoid valve 42, and the bottom end of the hose 47 is fixedly connected to the upper surface of the hollow base 5 located in the air guide area 12. A second connecting hole 48 is opened on the rear side wall of the drawer unit 2, which matches the first connecting hole 46. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have the function of uniformly inserting and removing the drawer unit 2. This not only improves the convenience of removing the drawer unit 2 for inspection and maintenance, but also avoids the situation where the conductive plug component and the conductive female structure are damaged due to the impact insertion of the drawer unit 2.

[0021] The outer wall of the switch cabinet body 1 has multiple through holes, and the walls of the through holes are fixedly connected to push switches 18. Multiple push switches 18 are arranged in sequence with multiple control solenoid valves 42. One push switch 18 can specifically control the opening and closing of the control solenoid valve 42 in a uniform speed plugging and unplugging mechanism 4, ensuring the convenience of using multiple uniform speed plugging and unplugging mechanisms 4.

[0022] A hollow base 5 is fixedly connected to the bottom of the switch cabinet body 1. A normally closed solenoid valve 16 and an exhaust pipe 17 are fixedly embedded in the rear side wall of the hollow base 5. The normally closed solenoid valve 16 is located at the bottom of the hollow base 5. When the normally closed solenoid valve 16 is opened, it can discharge excess water accumulated inside the hollow base 5. A rectangular through hole is opened on the rear side wall of the hollow base 5, and a support plate 10 is fixedly connected to the wall of the rectangular through hole. An installation through hole that matches the support plate 10 is opened on the front side wall of the hollow base 5. A partition 11 is fixedly connected to the upper surface of the support plate 10 and the inner wall of the hollow base 5. The partition 11 divides the top of the hollow base 5 into an air guiding area 12 and a mechanical area 13.

[0023] A PLC controller 14, an air pump 15, and a cooling auxiliary mechanism 6 are fixedly connected to the upper surface of the support plate 10 in the mechanical area 13. The cooling auxiliary mechanism 6 includes a small compressor 61 fixedly connected to the upper surface of the support plate 10. A circular hole is opened on the upper surface of the support plate 10 in the mechanical area 13, and a heat insulation cylinder 62 is fixedly connected to the wall of the circular hole. The air outlet end of the air pump 15 is fixedly connected to a first air pipe 63, and the air outlet end of the first air pipe 63 is fixedly connected to the top end of the heat insulation cylinder 62. A three-way pipe 64 is fixedly connected to the bottom side wall of the heat insulation cylinder 62. One of the air outlets of the three-way pipe 64 is fixedly connected to a second air pipe 65. The air outlet of the second air pipe 65 passes through the partition 11 and connects to the air guiding area 12. The other air outlet of the three-way pipe 64 is fixedly connected to a large air guiding pipe 66. A conductive connector 67 is sealed to the top of the large air guiding pipe 66. The wire of the conductive connector 67 passes through the bottom end of the large air guiding pipe 66 and is electrically connected to the input terminal of the PLC controller 14. The conductive connector 67 is electrically connected to a temperature and humidity sensor 68. The temperature and humidity sensor 68 is fixedly embedded in the top of the switch cabinet body 1. The top of the switch cabinet body 1 has a fixed through hole that matches the temperature and humidity sensor 68. The pipe wall of the air guide pipe 66 is fixedly connected to an air supply assembly 8 with the same number as the drawer unit 2. The heat insulation cylinder 62 has an evaporator coil 69 inside. The top of the evaporator coil 69 passes through the outer wall of the heat insulation cylinder 62 and is fixedly connected to the inlet pipe of the small compressor 61. The delivery pipe of the small compressor 61 passes through the lower surface of the support plate 10 and is fixedly connected to the condenser assembly 9. The bottom end of the condenser assembly 9 is fixedly connected to a throttle valve pipe 610. The top of the throttle valve pipe 610 passes through the bottom end of the heat insulation cylinder 62 and is fixedly connected to the bottom end of the evaporator coil 69. The bottom end of the heat insulation cylinder 62 is fixedly connected to a drain check valve 611. This mechanism can not only achieve the dehumidification effect, but also assist in the heat dissipation inside the switch cabinet body 1.

[0024] The air supply assembly 8 includes a third air pipe 81 that is fixedly connected to the outer wall of the air guide tube 66. An L-shaped fixing block 82 is fixedly sleeved on the wall of the air guide tube 66. Two threaded holes 83 are opened on the outer wall of the L-shaped fixing block 82. The air outlet end of the third air pipe 81 is fixedly connected to an external threaded pipe 84 that mates with the first connecting hole 46 and the second connecting hole 48. Two fixing nuts 85 are threadedly connected to the wall of the external threaded pipe 84. This mechanism can not only deliver air to quickly cool the drawer unit 2, but also connect the connecting block 45 and the drawer unit 2 into a whole, which facilitates the uniform speed insertion and removal mechanism 4 to drive the drawer unit 2 to work uniformly.

[0025] The condenser assembly 9 includes an L-shaped hollow tube 91, with multiple L-shaped capillary tubes 92 fixedly connected to the tube wall of the L-shaped hollow tube 91. The inlet end of the throttle valve pipeline 610 is fixedly connected to the bottom end of the L-shaped hollow tube 91. The bottom end of the output pipeline of the small compressor 61 is fixedly connected to the top end of the L-shaped hollow tube 91. A support bar 93 is fixedly connected to the inner wall of the bottom end of the hollow base 5. A cooling fan 94 is fixedly connected to the upper surface of the support bar 93. An air guide shroud 95 is fixedly connected to the air inlet side of the cooling fan 94. The air inlet end of the air guide shroud 95 passes through the rear side wall of the hollow base 5. A liquid level sensor 96 is fixedly connected to the lower surface of the support bar 93. This mechanism can not only expand the heat dissipation area of ​​the L-shaped hollow tube 91, but also make full use of the water generated by dehumidification to assist in rapid cooling.

[0026] The air intake end of the air pump 15 is fixedly connected to a filter assembly 7. The filter assembly 7 includes an air intake hood 71 fixedly connected to the upper surface of the support plate 10. A filter screen 72 is fixedly connected to the inner wall of the air intake hood 71 at an incline. An activated carbon filter plate 73 is fixedly connected to the outer wall of the filter screen 72. The side wall of the air intake hood 71 is fixedly connected to the air intake end of the air pump 15. This mechanism can filter and remove impurities from the air drawn in by the air pump 15.

[0027] The control solenoid valve 42, the small compressor 61, the normally closed solenoid valve 16, and the cooling fan 94 are all electrically connected to the output terminal of the PLC controller 14 via wires. The output circuits of the liquid level sensor 96 and the multiple push-button switches 18 are all electrically connected to the input terminal of the PLC controller 14 via wires. The above-mentioned power supply equipment and electrical connections are all existing technologies and will not be described in detail here.

[0028] The operating principle of the present invention is described as follows: Before the MNS type low-pressure withdrawable switch cabinet is used, not only is refrigerant added inside the circuit composed of small compressor 61, evaporator coil 69, throttle valve pipeline 610 and condenser assembly 9, but also the gas supply assembly 8 is installed inside the switch cabinet body 1, and the gas outlet end of the gas supply assembly 8 is placed inside the drawer unit 2. At the same time, multiple uniform speed insertion and removal mechanisms 4 are sequentially installed at the top of the switch cabinet body 1 or the lower surface of the support mesh plate 3 at the top of multiple drawer units 2. Meanwhile, the external threaded pipe 84 of the gas supply assembly 8 passes through the first connecting hole 46 and the second connecting hole 48. Then, the external threaded pipe 84, the connecting block 45 and the drawer unit 2 are fixed together by the fixing nut 85, and the gas supply and exhaust pipe 17 and the normally closed solenoid valve 16 are connected to the corresponding delivery pipe. When the MNS type low-voltage withdrawable switchgear operates in a humid environment, the PLC controller 14 first controls the air pump 15 to operate. The air pump 15 filters and removes impurities from the drawn-in air through the filter assembly 7. Furthermore, the temperature and humidity inside the switchgear body 1 are detected by the temperature and humidity sensor 68 at the heat dissipation and exhaust position on the top of the switchgear body 1, and the detected temperature and humidity values ​​are sent to the PLC controller 14 in the form of electrical signals. If the temperature and humidity sensor 68 detects that the humidity value of the air discharged from inside the switchgear body 1 exceeds the preset high humidity threshold of the PLC controller 14, the PLC controller 14 controls the small compressor 61 and the cooling fan 94 to operate. The small compressor 61 compresses the gaseous refrigerant... The gas is compressed into a high-temperature, high-pressure gas, which is then liquefied into a high-pressure liquid by the condenser assembly 9. The L-shaped capillary tube 92 can expand the heat dissipation area of ​​the L-shaped hollow tube 91. The cooling fan 94 draws in outside air through the air guide shroud 95 and blows it onto the condenser assembly 9 to cool it down. After cooling, the air is discharged through the exhaust pipe 17. The high-pressure liquid discharged from the condenser assembly 9 is depressurized into a low-temperature, low-pressure liquid through the throttling valve pipe 610. Finally, it absorbs heat and vaporizes in the evaporator coil 69, carrying away the heat from the air inside the insulation cylinder 62, thus lowering the air temperature. At this time, the moisture carried in the air will be liquefied into water droplets in the low-temperature environment and fall to the bottom of the insulation cylinder 62. Finally, the water is discharged into the bottom of the hollow base 5 through the drain check valve 611. The PLC controller 14 increases the dryness of the air injected into the switchgear body 1 by using low-temperature dehumidification, thereby ensuring that the internal components of the switchgear body 1 are dry. This prevents short circuits caused by condensation on the conductive components inside the switchgear body 1. Moreover, the higher the humidity value, the more the PLC controller 14 increases the blowing speed of the cooling fan 94 based on the input humidity value signal, thereby improving the heat dissipation efficiency of the cooling fan 94 on the L-shaped hollow tube 91 and L-shaped capillary tube 92. Consequently, the heat absorption and cooling effect of the evaporator coil 69 is also improved, ensuring that the switchgear body 1 can operate reliably in a dry environment. Furthermore, the water discharged into the hollow base 5 can also assist in the heat dissipation of the condenser assembly 9, as the water can quickly absorb a large amount of heat during evaporation. To ensure rapid heat dissipation of the refrigerant inside the condenser assembly 9, the evaporated water will be discharged from the exhaust duct 17 with the air. If there is too much water at the bottom of the hollow base 5 and the water level touches the liquid level sensor 96, the liquid level sensor 96 sends an electrical signal to the PLC controller 14. The PLC controller 14 controls the normally closed solenoid valve 16 to be energized and opened for 1 minute. After the normally closed solenoid valve 16 is opened, it can discharge the excess water at the bottom of the hollow base 5, preventing the excessive water from submerging the cooling fan 94 and affecting the normal operation of the cooling auxiliary mechanism 6. By improving the heat dissipation of the condenser assembly 9, the cooling effect of the cooling auxiliary mechanism 6 is improved, and conversely, the power consumption of the cooling auxiliary mechanism 6 during operation can be reduced, achieving the purpose of energy saving and environmental protection. If the MNS type low-voltage withdrawable switchgear is located at an altitude exceeding 2000 meters, and the thin air causes heat accumulation inside the switchgear body 1, creating a high-temperature environment, the temperature and humidity sensor 68 will detect that the temperature inside the switchgear body 1 exceeds the preset high-temperature threshold of the PLC controller 14. The PLC controller 14 will then control the frequency converter of the vacuum pump 15 to change the power frequency supplied to the vacuum pump 15 motor. The PLC controller 14 and the frequency converter transmit data via a communication protocol. The PLC controller 14 sends a frequency increase command to the frequency converter, which adjusts its output frequency according to the received command, thereby increasing the speed of the vacuum pump 15 motor to achieve vacuuming. With the increase in speed, the air pump 15 then injects air into the heat insulation cylinder 62 through the first air pipe 63. The air then enters the air guiding area 12 and the interior of multiple air supply components 8 through the three-way pipe 64, the second air pipe 65 and the air guide thick pipe 66. The air supply components 8 allow more air to be introduced into the switch cabinet body 1 for heat dissipation, avoiding interference from the thin air environment of the plateau on the heat dissipation of the switch cabinet body 1. The air from the air supply components 8 is delivered to the interior of the drawer unit 2 through the third air pipe 81 and the external threaded pipe 84, which quickly cools down the conductive components inside the drawer unit 2. The cooled air is then drawn out by the cooling fan at the top of the switch cabinet body 1, ensuring that the switch cabinet body 1 can work normally and reliably. If the air pump 15 operates for 3 minutes after increasing its pumping speed, and the temperature and humidity sensor 68 detects that the temperature inside the switch cabinet body 1 still exceeds the preset high temperature threshold of the PLC controller 14, the PLC controller 14 will control the small compressor 61 of the cooling auxiliary mechanism 6 to work, and reduce the temperature inside the heat insulation cylinder 62 through the evaporator coil 69, thereby lowering the temperature of the air injected into the switch cabinet body 1. The low temperature air accelerates the cooling effect inside the switch cabinet body 1, preventing the switch cabinet body 1 from being damaged by continuous high temperature. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have intelligent moisture-proof and efficient cooling functions, improves the protection performance of the MNS type low-voltage withdrawable switch cabinet, and can adapt to the use requirements of humid environments and work positions at altitudes exceeding 2000 meters, ensuring the safety of continuous use of the MNS type low-voltage withdrawable switch cabinet, improving the versatility of the MNS type low-voltage withdrawable switch cabinet, and increasing the convenience for customers to purchase the MNS type low-voltage withdrawable switch cabinet. When the MNS type low-voltage withdrawable switchgear requires the drawer unit 2 to be pulled out for inspection or maintenance, the operator presses the push switch 18 corresponding to the drawer unit 2 to be pulled out. The push switch 18 sends an electrical signal to the PLC controller 14 to pull out the drawer unit 2. The PLC controller 14 then controls the control solenoid valve 42 corresponding to the drawer unit 2 to be pulled out, energizing and opening the solenoid valve 42 for 30 seconds. During these 30 seconds, the PLC controller 14 also controls the air pump 15 to operate, supplying air to the air guide area 12. The air inside the air guide area 12 is then input into the cylinder 41 through the hose 47 and the open control solenoid valve 42, causing the cylinder 41 to extend. Furthermore, as the cylinder 41 extends... Since the inner diameter of the exhaust nozzle 43 is the same as that of the control solenoid valve 42, the amount of air injected into and discharged by the cylinder 41 is equal. The extension of the cylinder 41 has a damping effect, ensuring that the cylinder 41 can extend at a uniform speed. During the uniform extension of the cylinder 41, the cylinder 41 drives the drawer unit 2 to be automatically pulled out at a uniform speed through the external threaded tube 84, the fixing nut 85 and the connecting block 45. This eliminates the need for the staff to manually move the drawer unit 2, ensuring that the conductive plug component of the drawer unit 2 can be separated from the conductive female base structure inside the switch cabinet body 1 at a uniform speed. Finally, after the drawer unit 2 is pulled out, the fixing nut 85 is separated to separate the external threaded tube 84 from the first connecting hole 46 in the connecting block 45, so that the drawer unit 2 can be removed without restraint, which facilitates the inspection and maintenance of the drawer unit 2. If drawer unit 2 needs to be installed on switch cabinet body 1, first install drawer unit 2 into the corresponding drawer hole of switch cabinet body 1, and simultaneously insert external threaded tube 84 into the second connecting hole 48 and the first connecting hole 46 in sequence. Then, limit the position with fixing nut 85. After that, the operator pushes drawer unit 2 to insert it. While pushing drawer unit 2, the operator also needs to press the corresponding push switch 18. Pressing switch 18 energizes the corresponding control solenoid valve 42 and opens it for 30 seconds. At this time, since the inner diameter of exhaust nozzle 43 and control solenoid valve 42 are the same, the amount of air drawn into cylinder 41 from exhaust nozzle 43 is the same as the amount of air discharged from control solenoid valve 42. Due to the limitation of the inner diameter of control solenoid valve 42, the resistance of rapid exhaust during the retraction of cylinder 41 is large, which has a self-damping effect, thus ensuring that cylinder 41 retracts at a uniform speed. The uniformly contracting cylinder 41 can stably insert the conductive plug component of drawer unit 2 into the conductive female socket structure inside the switch cabinet body 1, avoiding the rapid impact insertion of the conductive plug component of drawer unit 2 into the conductive female socket structure inside the switch cabinet body 1. This reduces damage between the conductive plug component and the conductive female socket structure, and prevents overheating failure due to increased contact resistance at this connection point. This ensures the continuous and stable operation of the switch cabinet body 1 and drawer unit 2. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have the function of uniformly inserting and removing drawer unit 2. This not only improves the convenience of removing and inspecting and maintaining drawer unit 2, but also avoids damage between the conductive plug component and the conductive female socket structure caused by impact insertion of drawer unit 2. This also avoids overheating due to increased contact resistance at this location, and improves the reliability of the MNS type low-voltage withdrawable switch cabinet.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-protection intelligent safety MNS type low-voltage withdrawable switchgear, comprising a switchgear body (1), multiple drawer units (2), and multiple support mesh plates (3) for supporting the drawer units (2), wherein the multiple support mesh plates (3) are all fixedly connected to the inner wall of the switchgear body (1), characterized in that, The top of the drawer unit (2) is provided with a uniform speed insertion and removal mechanism (4), and the tops of multiple uniform speed insertion and removal mechanisms (4) are fixedly connected to the lower surface of the support mesh plate (3) and the top of the switch cabinet body (1) by bolts. A hollow base (5) is fixedly connected to the bottom of the switch cabinet body (1). A rectangular through hole is opened on the rear side wall of the hollow base (5), and a support plate (10) is fixedly connected to the wall of the rectangular through hole. An installation through hole that matches the support plate (10) is opened on the front side wall of the hollow base (5). A partition plate (11) is fixedly connected to the upper surface of the support plate (10) and the inner wall of the hollow base (5). The partition plate (11) divides the top of the hollow base (5) into an air guiding area (12) and a mechanical area (13). The support plate (10) is fixedly connected to the upper surface of the mechanical area (13) by a PLC controller (14), an air pump (15) and a cooling auxiliary mechanism (6). The air inlet of the air pump (15) is fixedly connected to a filter assembly (7). The uniform speed insertion and removal mechanism (4) includes a cylinder (41). The two vent holes of the cylinder (41) are respectively fixedly connected to a control solenoid valve (42) and an exhaust nozzle (43). The inner diameters of the control solenoid valve (42) and the exhaust nozzle (43) are the same. Two fixing rings (44) are fixedly connected to the outer wall of the cylinder (41). A connecting block (45) is fixedly connected to the moving end of the cylinder (41). A first connecting hole (46) is opened on the outer wall of the connecting block (45). A hose (47) is fixedly connected to the air inlet end of the control solenoid valve (42). The bottom end of the hose (47) is fixedly connected to the upper surface of the hollow base (5) located in the air guide area (12). A second connecting hole (48) that matches the first connecting hole (46) is opened on the rear side wall of the drawer unit (2). The cooling auxiliary mechanism (6) includes a small compressor (61) fixedly connected to the upper surface of the support plate (10). The support plate (10) has a circular hole on the upper surface of the mechanical area (13), and a heat insulation cylinder (62) is fixedly connected to the wall of the circular hole. The air outlet of the air pump (15) is fixedly connected to a first air pipe (63). The air outlet of the first air pipe (63) is fixedly connected to the top of the heat insulation cylinder (62). A three-way pipe (64) is fixedly connected to the bottom side wall of the heat insulation cylinder (62). One of the outlet ends of the pipe (64) is fixedly connected to a second air pipe (65). The outlet end of the second air pipe (65) passes through the partition (11) and is connected to the air guide area (12). The other outlet end of the three-way pipe (64) is fixedly connected to a large air guide pipe (66). The top end of the large air guide pipe (66) is sealed with a conductive connector (67). The wire of the conductive connector (67) passes through the bottom end of the large air guide pipe (66) and is electrically connected to the input end of the PLC controller (14). The power terminal of the device (67) is electrically connected to a temperature and humidity sensor (68). The temperature and humidity sensor (68) is fixedly embedded in the top of the switch cabinet body (1). The top of the switch cabinet body (1) has a fixed through hole that matches the temperature and humidity sensor (68). The pipe wall of the air guide pipe (66) is fixedly connected to an air supply assembly (8) with the same number as the drawer unit (2). The heat insulation cylinder (62) is equipped with an evaporator coil (69). The top of the evaporator coil (69) passes through the heat insulation cylinder (67). 2) The outer wall of the small compressor (61) is fixedly connected to the inlet pipe of the small compressor (61). The delivery pipe of the small compressor (61) passes through the lower surface of the support plate (10) and is fixedly connected to the condenser assembly (9). The bottom end of the condenser assembly (9) is fixedly connected to the throttle valve pipe (610). The top end of the throttle valve pipe (610) passes through the bottom end of the heat insulation cylinder (62) and is fixedly connected to the bottom end of the evaporator coil (69). The bottom end of the heat insulation cylinder (62) is fixedly connected to the drain check valve (611). The air delivery assembly (8) includes a third air pipe (81) that is fixedly connected to the outer wall of the air guide tube (66). An L-shaped fixing block (82) is fixedly sleeved on the wall of the air guide tube (66). Two threaded holes (83) are opened on the outer wall of the L-shaped fixing block (82). The air outlet end of the third air pipe (81) is fixedly connected to an external threaded pipe (84) that cooperates with the first connecting hole (46) and the second connecting hole (48). Two fixing nuts (85) are threadedly connected to the wall of the external threaded pipe (84).

2. The high-protection intelligent safety MNS type low-voltage withdrawable switchgear according to claim 1, characterized in that, The filter assembly (7) includes an air intake hood (71) fixedly connected to the upper surface of the support plate (10). The inner wall of the air intake hood (71) is fixedly connected with a filter screen (72) at an incline. The outer wall of the filter screen (72) is fixedly connected with an activated carbon filter plate (73). The side wall of the air intake hood (71) is fixedly connected to the air intake end of the air pump (15).

3. The high-protection intelligent safety MNS type low-voltage withdrawable switchgear according to claim 1, characterized in that, The condenser assembly (9) includes an L-shaped hollow tube (91), the wall of which is fixedly connected to a plurality of L-shaped capillary tubes (92). The inlet end of the throttle valve pipeline (610) is fixedly connected to the bottom wall of the L-shaped hollow tube (91). The bottom end of the output pipeline of the small compressor (61) is fixedly connected to the top end of the L-shaped hollow tube (91). A support bar (93) is fixedly connected to the inner wall of the bottom end of the hollow base (5). A cooling fan (94) is fixedly connected to the upper surface of the support bar (93). A guide shroud (95) is fixedly connected to the air inlet side of the cooling fan (94). The air inlet end of the guide shroud (95) passes through the rear side wall of the hollow base (5). A liquid level sensor (96) is fixedly connected to the lower surface of the support bar (93).

4. The high-protection intelligent safety MNS type low-voltage withdrawable switchgear according to claim 3, characterized in that, The hollow base (5) has a normally closed solenoid valve (16) and an exhaust pipe (17) fixedly embedded in its rear side wall. The normally closed solenoid valve (16) is located at the bottom of the hollow base (5).

5. The high-protection intelligent safety MNS type low-voltage withdrawable switchgear according to claim 1, characterized in that, The outer wall of the switch cabinet body (1) is provided with multiple through holes, and the walls of the through holes are fixedly connected with push switches (18). The multiple push switches (18) are arranged in sequence with multiple control solenoid valves (42).

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